// Copyright (c) Appeon. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

using System;
using System.Collections.Generic;
using System.Text;

namespace SnapObjects.Data
{
    internal abstract class SqlRawStatementGenerator : SqlStatementGenerator
    {
        public SqlRawStatementGenerator(
            ISqlStatementFactory factory,
            ISqlGenerationHelper helper,
            ITypeMapper typeMapper) : base(factory, helper, typeMapper)
        {
        }

        public override SqlSyntaxDescription Create(SqlStatement statement)
        {
            var tokens = ((SqlRawStatement)statement).SqlRaw;

            var builder = new StringBuilder();

            var parameters =
                new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

            for (var i = 0; i < tokens.Count; i++)
            {
                if (tokens[i].Type == SqlTokenType.Parameter)
                {
                    var parameterName = this.GenerateParameterName(tokens[i].Text);

                    if (!parameters.ContainsKey(tokens[i].Text))
                    {
                        parameters.Add(tokens[i].Text, parameterName);
                    }

                    builder.Append(parameterName);
                }
                else
                {
                    builder.Append(tokens[i].Text);
                }
            }

            return new SqlSyntaxDescription(builder.ToString(), parameters);
        }
    }
}
